What is the primary function of a heat detector used in a family unit?

The primary function of a heat detector is to detect temperature changes that indicate a fire hazard. These devices are specifically designed to respond to an increase in temperature caused by a fire, rather than the smoke produced by it. By sensing excessive heat, the detector can trigger alarms to alert occupants of a potential fire situation, allowing for timely evacuation and response.

While detecting smoke is a primary function of smoke detectors, heat detectors do not rely on smoke but rather on temperature elevation to operate. Additionally, while heat detectors can activate alarms, their primary purpose is to monitor temperature changes. The signaling for evacuation is a result of the alarm activation rather than a function of the heat detector itself. Thus, focusing on the core function, heat detectors are vital for early fire detection based on temperature, ensuring safety in family units.